Are there any sleeping giants with great cash flow, but also potential booming economic factors? 

The state has turned over my account to an outside collector.

Boom squatters.

Indianapolis is rapidly reinventing its downtown, with vigorous levels of rental apartment and condo development—prompting a construction boom in downtown offices.

Are there any sleeping giants with great cash flow, but also potential booming economic factors?

Typically builders will only wiggle so much, in a good economy with a building boom, its hard to negotiate on anything with them. 

Historically with these refi booms, what we see is that rates fall slowly over the course of time.

Booming and diverse: tech, mining, oil refineries, ski industry, universities, hospitals, and low taxes.

I started in the middle of the boom, so I've lived this madness from the beginning.

Leander does not necessarily have their own, but relies extensively on Austin.As far as growth and appreciation, it's easier to look like there's a boom when there wasn't much there before (Leander).